I had an eye problem doctors call NAION (do a Google) that in severe cases can make you blind.
Capsaicin (the active ingredient in cayenne) healed my right eye beautifully, as checked by an MD.
I intend to keep taking it forever.

Toronto's University has found out mega doses of Vit D helps Multiple Sclerosis sufferers. My wife started taking 15,000 U per day of it.
She feels an overall improvement after the first week, and her MD has agreed she may keep taking it (blood tests will be made regularly to check for possible toxicity).